Fix bug with unused (replaced with "") CONSUL_HTTP_AUTH in some places #3395
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example: https://github.com/hashicorp/consul/blob/master/watch/plan.go#L26
how to reproduce bug:
0. consul -> localhost:8500 with more than 0 service checks
CONSUL_HTTP_AUTH= consul watch -http-addr=localhost:8500 -type=checks # --> return []
consul watch -http-addr=localhost:8500 -type=checks -token= # -> return { .... right json result .... }